Question: please help me understand the Vertical line test in graphs to determine if a line is a function My text book states, if

please help me understand the " Vertical line test in graphs to determine if a line is a function" My text book states, " if any vertical line crosses the x axis in the domain intersects the graph in more than one point , it is a graph of a relation that is not a function. I don't understand how any line can not intersect the graph in more than one place?

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